Quick answers
- Which hospitals does Greg S. Yen work at?
- Medicare's official clinician data lists Greg S. Yen at 1 hospital: San Gabriel Valley Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Greg S. Yen see patients?
- Medicare's clinician data lists 4 practice locations, including San Gabriel, CA, Alhambra, CA and Monterey Park, CA. Call before your visit to confirm the address.
- What is Greg S. Yen's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Greg S. Yen accept Medicare assignment?
- Medicare's clinician data says Greg S. Yen may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Greg S. Yen?
- (626) 287-6746, as listed in official Medicare / NPI Registry data.
- What is Greg S. Yen's NPI number?
- 1093739021. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Greg S. Yen works
Medicare's Facility Affiliation Data lists Greg S. Yen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- San Gabriel Valley Medical CenterSan Gabriel, CA · Acute Care Hospital · CCN 050132
Practice locations
Addresses where Greg S. Yen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1129 S San Gabriel BlvdSan Gabriel, CA 91776 (626) 287‑6746
- 131 E Las Tunas DrSan Gabriel, CA 91776
- 1522 S Garfield Ave, Suite AAlhambra, CA 91801 (626) 576‑8500
- 208 N Garfield AveMonterey Park, CA 91754 (626) 287‑6746
Group practices
Medicare enrollment lists Greg S. Yen as a member of this group (CMS data updated 2026-10-02).
- David C P Chen, M.D., Inc19 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in San Gabriel
Clinicians with the same Medicare primary specialty in San Gabriel, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | George Washington University School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1093739021 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians